[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/12176] Add functional test for founder deletion message.

PHPBB3-12176
[ticket/12176] Display correct message when trying to delete founder.

PHPBB3-12176
[ticket/10945] remove trigger_error call

removes trigger_error call incase no search results are found or start
variable exceeds the amount. So that search query is displayed in the
search box even if no results are returned.

PHPBB3-10945
[ticket/10945] Display search query when search fails in native search

If search fails and common words are present, split_keywords returns false
and search.php file prints appropriate message of common words.
If search fails and there are no common words, split_keywords returns true
and keyword_search returns false so that the search query is displayed in
search box.

PHPBB3-10945
[ticket/10945] Fix return values for split_keywords function

The function now returns false if all the words are common words and true
otherwise.

PHPBB3-10945
Merge remote-tracking branch 'remotes/dhruvgoel92/ticket/10945' into develop-olympus

* remotes/dhruvgoel92/ticket/10945:
  [ticket/10945] Fix return values for split_keywords function
  [ticket/10945] Display search query when search fails in native search
  [ticket/10945] remove trigger_error call