Revert changes relative to lib/*.[ch] recent renaming

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

  f871de0... build: make use of 76 lib/*.h renamed files
  ffd8e12... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

  c087374... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

  13606bb... build: make use of 93 lib/*.c renamed files
  5b6e792... build: rename 93 lib/*.c files
  7d83dff... build: commit 13606bbfde follow-up 1

Start of related discussion thread:

  http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

  http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

  http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

  lib/curl_imap.h
  lib/curl_smtp.h

1 files changed, 107 insertions, 0 deletions

diff --git a/lib/hash.h b/lib/hash.h
new file mode 100644
index 000000000..3fa621cb1
--- /dev/null
+++ b/lib/hash.h
@@ -0,0 +1,107 @@
+#ifndef HEADER_CURL_HASH_H
+#define HEADER_CURL_HASH_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2007, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "setup.h"
+
+#include <stddef.h>
+
+#include "llist.h"
+
+/* Hash function prototype */
+typedef size_t (*hash_function) (void* key,
+                                 size_t key_length,
+                                 size_t slots_num);
+
+/*
+   Comparator function prototype. Compares two keys.
+*/
+typedef size_t (*comp_function) (void* key1,
+                                 size_t key1_len,
+                                 void*key2,
+                                 size_t key2_len);
+
+typedef void (*curl_hash_dtor)(void *);
+
+struct curl_hash {
+  struct curl_llist **table;
+
+  /* Hash function to be used for this hash table */
+  hash_function hash_func;
+
+  /* Comparator function to compare keys */
+  comp_function comp_func;
+  curl_hash_dtor   dtor;
+  int slots;
+  size_t size;
+};
+
+struct curl_hash_element {
+  void   *ptr;
+  char   *key;
+  size_t key_len;
+};
+
+struct curl_hash_iterator {
+  struct curl_hash *hash;
+  int slot_index;
+  struct curl_llist_element *current_element;
+};
+
+int Curl_hash_init(struct curl_hash *h,
+                   int slots,
+                   hash_function hfunc,
+                   comp_function comparator,
+                   curl_hash_dtor dtor);
+
+struct curl_hash *Curl_hash_alloc(int slots,
+                                  hash_function hfunc,
+                                  comp_function comparator,
+                                  curl_hash_dtor dtor);
+
+void *Curl_hash_add(struct curl_hash *h, void *key, size_t key_len, void *p);
+int Curl_hash_delete(struct curl_hash *h, void *key, size_t key_len);
+void *Curl_hash_pick(struct curl_hash *, void * key, size_t key_len);
+void Curl_hash_apply(struct curl_hash *h, void *user,
+                     void (*cb)(void *user, void *ptr));
+int Curl_hash_count(struct curl_hash *h);
+void Curl_hash_clean(struct curl_hash *h);
+void Curl_hash_clean_with_criterium(struct curl_hash *h, void *user,
+                                    int (*comp)(void *, void *));
+void Curl_hash_destroy(struct curl_hash *h);
+
+size_t Curl_hash_str(void* key, size_t key_length, size_t slots_num);
+size_t Curl_str_key_compare(void*k1, size_t key1_len, void*k2,
+                            size_t key2_len);
+
+void Curl_hash_start_iterate(struct curl_hash *hash,
+                             struct curl_hash_iterator *iter);
+struct curl_hash_element *
+Curl_hash_next_element(struct curl_hash_iterator *iter);
+
+void Curl_hash_print(struct curl_hash *h,
+                     void (*func)(void *));
+
+
+#endif /* HEADER_CURL_HASH_H */
+