Fixes #204

Let interfaces override __adapt__

Cooperate with InterfaceClass to ensure there is no performance penalty for this. Fixes #3

+-------------------------------------------------------------+----------------+------------------------------+------------------------------+
| Benchmark                                                   | bench_master38 | bench_issue3                 | bench_issue3_opt             |
+=============================================================+================+==============================+==============================+
| call interface (provides; deep)                             | 369 ns         | 454 ns: 1.23x slower (+23%)  | not significant              |
+-------------------------------------------------------------+----------------+------------------------------+------------------------------+
| call interface (provides; wide)                             | 373 ns         | 457 ns: 1.22x slower (+22%)  | 365 ns: 1.02x faster (-2%)   |
+-------------------------------------------------------------+----------------+------------------------------+------------------------------+
| call interface (no alternate, no conform, not provided)     | 671 ns         | 760 ns: 1.13x slower (+13%)  | 636 ns: 1.06x faster (-5%)   |
+-------------------------------------------------------------+----------------+------------------------------+------------------------------+
| call interface (alternate, no conform, not provided)        | 395 ns         | 494 ns: 1.25x slower (+25%)  | not significant              |
+-------------------------------------------------------------+----------------+------------------------------+------------------------------+
| call interface (no alternate, valid conform, not provided)  | 250 ns         | not significant              | 227 ns: 1.10x faster (-9%)   |
+-------------------------------------------------------------+----------------+------------------------------+------------------------------+
| call interface (alternate, invalid conform, not provided)   | 348 ns         | 424 ns: 1.22x slower (+22%)  | not significant              |
+-------------------------------------------------------------+----------------+------------------------------+------------------------------+

Remove the bare except: statements.

Comparing to current master, there is no substantial difference.

+-------------------------------------------------------------+----------------+------------------------------+
| Benchmark                                                   | bench_master38 | bench_issue200               |
+=============================================================+================+==============================+
| call interface (alternate, no conform, not provided)        | 395 ns         | 414 ns: 1.05x slower (+5%)   |
+-------------------------------------------------------------+----------------+------------------------------+
| call interface (no alternate, valid conform, not provided)  | 250 ns         | 240 ns: 1.04x faster (-4%)   |
+-------------------------------------------------------------+----------------+------------------------------+
| read __module__                                             | 45.3 ns        | 43.4 ns: 1.04x faster (-4%)  |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (no registrations)                            | 3.23 ms        | 3.31 ms: 1.02x slower (+2%)  |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (all trivial registrations)                   | 3.93 ms        | 4.40 ms: 1.12x slower (+12%) |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (all trivial registrations, wide inheritance) | 43.3 us        | 45.5 us: 1.05x slower (+5%)  |
+-------------------------------------------------------------+----------------+------------------------------+
| query adapter (all trivial registrations, deep inheritance) | 43.2 us        | 46.9 us: 1.09x slower (+9%)  |
+-------------------------------------------------------------+----------------+------------------------------+
| sort mixed                                                  | 361 us         | 354 us: 1.02x faster (-2%)   |
+-------------------------------------------------------------+----------------+------------------------------+
| contains (populated dict: interfaces)                       | 61.3 ns        | 59.7 ns: 1.03x faster (-3%)  |
+-------------------------------------------------------------+----------------+------------------------------+

Not significant (13): call interface (provides; deep); call interface (provides; wide); call interface (no alternate, no conform, not provided); call interface (alternate, invalid conform, not provided); read __name__; read __doc__; read providedBy; sort interfaces; sort implementedBy; contains (empty dict); contains (populated list: interfaces); contains (populated dict: implementedBy); contains (populated list: implementedBy)

Only catch AttributeError instead of everything.

Fixes #200

Note that this does break a doctest in five.intid (it's expecting a TypeError but it now gets Acquisition's RuntimeError).