Update generic repo update page

Update core and plugin versions

Align method signatures to updated parent class

search.php: fix changesets per page ...

Number of changesets per page was not passed on to filter->find() so the
page would always display 25 changesets.

This has not been an issue so far, because $f_perpage is currently
hardcoded to 25.

HTML/CSS fixes for list.php

New API to display pagination links ...

The new Source_View_Pagination() function removes redundant code from
the search and list pages, and improves it by

- using a closure instead of create_function()
- use MantisBT standard "first/prev/next/last" instead of "<</>>"
- print fewer page links, increasing the gap between them depending on
  total number of changesets (total / 10 rounded to nearest 10)

HTML/CSS fixes for search.php

HTML/CSS fixes for repo_manage_page.php

HTML/CSS fixes for search_page.php

CSS improve layout with 'spacer' class for div

Fix PHP warning in search page

Fix deprecated warning for db_get_table()

HTML/CSS fixes for index.php

HTML/CSS fixes for manage_config_page.php ...

Use a form-container div instead of table

Remove calls to helper_alternate_class()

Replace deprecated <acronym> element by <abbr> ...

Reference: http://www.w3.org/TR/html5/obsolete.html#acronym

Fix HTML/CSS for account update form

Do not interpret HTML tags in changeset messages ...

When displaying changesets, the commit message is now manually
transformed (adding href, bug and bugnote links + nl2br) instead of
calling string_display_links(), which avoids unwanted html tags
processing by the MantisCoreFormatting plugin.  Rationale: commit
messages being plain text, any html they may contain should not be
considered as formatting and must be displayed as-is.

Fixes #93

Add 'Back to Index' link to search results page

Add 'Search' link to changesets list page

Fix crash caused by infinite loop ...

When there is no data in the changeset table, Source_Date_Select()
goes into an infinite loop and crashes as PHP runs out of memory.

Use specific error message for empty required field

Removing duplicate language strings

Replace occurences of deprecated `db_query` API ...

Compliance with future MantisBT version 1.3; reduce risk of sql
injection attacks.

Fixes #79

Add and update Russian translate

Catalan translation

Spanish translation

Fixed missing 'plugin_Source_import_latest_failed' string in strings_english.txt. Issue #57

Fix whitespace

Use Project access, not Global, when displaying changesets ...

Fixes #41