for a plugin installed run-time

(--xxx=ON behaving as --xxx=FORCE)

This can result in bad deadlocks (e.g loader lock), seen in latest crash reports.

since password characters can contain quotes or spaces.

The proper quoting method for command line arguments used here was  extracted from
http://blogs.msdn.com/b/twistylittlepassagesallalike/archive/2011/04/23/everyone-quotes-arguments-the-wrong-way.aspx

Additionally, mysql_install_db.exe now passes root password to "mysqld.exe --bootstrap"
 in hexadecimal form, to handle potential special chars inside password string literal.

Also, do not package aria log files in the zip package- not required for the database to function, 
also will avoid trouble with recovery, if someone  accidentially (or on purpose) upgrades by unpacking the zip in the existing install directory.

threads are retrieving events at the same time.

- Workaround linker bug that prevents linking aria test executables
   using -fno-common on OSX
- Skip system readline detection (OSX readline is incompatible one)
- Make Xcode generator work

(see my comments starting from [9 Apr 22:18])

The previous patch for the bug (that erroneously identified the bug as
bug 972973 in its comment) was incorrect. 
It turned out that the code that triggered the abort complain reported for
the bug was not needed at all.

When the function free_tmp_table deletes the handler object for
a temporary table the field TABLE::file for this table should be
set to NULL. Otherwise an assertion failure may occur.

This bug happened because the function find_field_in_view formed
autogenerated names of view columns without a possibility to roll
them back. In some situation it could cause memory misuses reported
by valgrind or even crashes.

        RB-tree index in the MEMORY table fails if it grews over 4G.
        That happened because the old_allocated variable in hp_rb_write_key()
        had the uint type. Changed with the 'size_t' type to be same as the
        'rb_tree.allocated'.

per-file comments:
  storage/heap/hp_write.c
MDEV-80 Memory engine table full at much less than max_heap_table_size with btree index.
        uint->size_t for the 'old_allocated'.

When a view/derived table is converted from merged to materialized the
items from the used_item lists are substituted for items referring to
the fields of the result of the materialization. The problem appeared
with queries employing natural joins. Since the resolution of a natural
join was performed only once the used_item list formed at the second
execution of the query lacked the references to the fields that were
used only in the equality predicates generated for the natural join.