No redefine warnings during reload
Remove exports from Bugzilla::Search
bzdbcopy.pl code style
get bzdbcopy.pl options from commandline
Check innodb in SHOW ENGINES (fix for MariaDB 10)
Enable Mozilla skin by default
Transform docbook documentation to asciidoc
asciidoc README
asciidoc CHANGELOG
no redefine warning in Bugzilla::Template
Use ThrowCodeError on die() while in console
Use ERROR_MODE_CONSOLE in cli scripts; remove extra html_strip
Fix indexes while doing DB updates

* Fix indexes while renaming keyworddefs
* Remove _visibility_value_id indexes when dropping visibility_value_id column from field tables
Create non-existing tables, fields and indexes during bzdbcopy.pl
Fix multiselect search bug
Warn when leaving page with unsaved comment
Localisation layer for Bugzilla, separated from templates

Languages are put into i18n/<lang>/ and consist of:
* messages.pl - messages for translating templates, substituted at compile time
* runtime.pl - messages that are needed in runtime, setup/strings.txt.pl is moved here
* messages.js - messages for JavaScripts

Templates aren't subdivided into languages anymore; the single
'template/localised' directory is used, and [% L('Message text') %]
or [% L('Message $1 text is $2', 'Param1', 'Param2') %] is used in
the templates. Both forms are substituted at template compile time.

Localised templates are auto-generated from English ones by the
contrib/extract-strings.pl script which also uses i18n/en/blacklist.pl
to determine what strings shouldn't be translated.

So, the commit includes:
* contrib/extract-strings.pl -- script for translating TT templates
* i18n/en/blacklist.pl -- blacklist of messages that should not be auto-extracted
* Template adjustments for more correct string extraction
  (for example, TT does not allow expressions in hash keys)
* Template adjustments for string extraction from JavaScript blocks
* js/*.js adjustments for using i18n messages
* Compile-time i18n message substitution implementation
* Bugzilla::Language class that manages loading of i18n messages