[ticket/11288] Handle +,- without preceeding whitespace characters

PHPBB3-11288
[ticket/11271] Displaying in-line attached images in ATOM feed.

In-line attached images are not displaying as they are not parsing.
Included 'parse_attachments' column name for data fetching queries
in feed.php. Checked weather feeds have in-line attachments and
parsed them by using parse_attachments() method.

PHPBB3-11271
[ticket/11271] Removed in-line attachment comments properly.

Added a new regex to remove in-line attachment comments.

PHPBB3-11271
[ticket/11271] Fetched feed attachments before loop.

Fetched feed attachments before looping through feed items and
send them to method 'feed_generate_content' for each feed item.

PHPBB3-11271
[ticket/11271] Separated attachment fetching query

Removed external query used to fetch related attachments.
Added attachments fetching method with database query to
post based feed.

PHPBB3-11271
[ticket/11271] Removing unnecessary database object

Removed unnecessary global database object from 'feed_generate_content'
Method.

PHPBB3-11271
[ticket/11271] Formatting code and removing null assignment.

Formatted code and replaced null assignment with empty array
assignment to attachments parameter in method 'feed_generate_content'.

PHPBB3-11271
[ticket/11271] Changed executable bit.

Changed executable bit value from 755 to 644.

PHPBB3-11271
[ticket/11271] Use absolute path for displaying inline attachments in feeds

PHPBB3-11271
[ticket/11271] Typecast forum and topic id to integer

PHPBB3-11271
[ticket/11271] Remove unnecessary inclusion of functions_display

PHPBB3-11271
[ticket/11271] Fix tabs and use !empty( ) instead of count( )

PHPBB3-11271
[ticket/11271] Add docblock of feed_generate_content( )

PHPBB3-11271
[ticket/11271] Make path conversion more precise

PHPBB3-11271
[ticket/12106] Adds a explaination that admin/mods still able to use the board

PHPBB3-12106
[ticket/12106] Combined first and second sentence

PHPBB3-12106
[ticket/12259] Reduce the size of our test matrix

Only test MariaDB or PostgreSQL once on PHP 5.4. This reduces our build matrix
by 10 builds (over half).

PHPBB3-12259
Merge pull request #2100 from Crizz0/ticket/10549

[ticket/10549] Adds language variables to Error messages MODULE...
Merge pull request #2105 from Crizz0/ticket/12106

[ticket/12106] Adds a explaination that admin/mods still able to use the...
Merge remote-tracking branch 'EXreaction/ticket/12259-olympus' into develop-olympus

* EXreaction/ticket/12259-olympus:
  [ticket/12259] Reduce the size of our test matrix