openchangedb: Impelement Logger module

openchangedb_logger is an example for doing staff during backend calls.

It could be hooked during openchangedb.c:openchangedb_initialize()
to log requests and return value from openchangedb.c:openchangedb_initialize()openchangedb.c:openchangedb_initialize()openchangedb.c:openchangedb_initialize()
openchangedb: Load openchangedb_logger module based on config option

For now it is very simple and not flexibble, but this approach
will allow us to 'stack' backend chains.
test: Fix OpenchangeDB logger test to reset stats on every test

- allocate root mem context with talloc_new() - easier tracking
- use checked_feature() so we reset everything on every test
test: Add 'debuglevel' and 'option' command line options
test: Avoid ck_assert_int_xx() macro side effect in older 'check' versions

Older version of check tend to expand function calls twice.
So we get every test function called twice in travis-ci and
failures all the way.

Older check.h goes like this:
#define _ck_assert_int(X, O, Y) ck_assert_msg((X) O (Y), "Assertion '"#X#O#Y"' failed: "#X"==%d, "#Y"==%d", X, Y)
Do not try backup apport configuration when running with gdb
Adding more info to duplicates
Give support to reopen an issue if it is closed when adding a duplicate
Merge pull request #123 from sixstone-qq/ejhernandez/enh-oc-crash-digger-Redmine

Enhacements to crash mining tool V.II
Merge pull request #119 from openchange/kamenim/ocdb-logger

OpenchangeDB logger module implementation
openchangedb: transactions on create_folder and set_folder_properties
Merge pull request #124 from openchange/jgarcia/transactions-folder-properties

openchangedb: transactions on create_folder and set_folder_properties
openchangedb: ignore ChangeNumber property when setting folder properties
Merge pull request #125 from openchange/jgarcia/ignore-change-number-sets

openchangedb: ignore ChangeNumber property when setting folder properties
Merge branch 'master' into jkerihuel/mapistore-python
[mapistore-python][sample-backend]: enable get and set properties for attachments
[mapistore-python][sample-backend]: fix set_properties and save (changes in folders and messages didn't have any effect)
[mapistore-python][sample-backend]: implement delete_message (hard deletion)
[pymapistore]: Fix get_properties behaviour (no arguments returns available properties, empty list returns no properties)
[mapistore-python]: Add return value check and memory allocation in get_available_properties