[harm_unit]: moved support function bool() to the start of the tag

This change is needed to have the function available for the whole tag.
[harm_unit]: renamed bool() function to toboolean()
[harm_unit]: moved the harmer advancement check inside the for cycle/valid check
[harm_unit]: added fire_event keys to wml_actions.unstore_unit tables

Fix for bug #20836
[harm_unit]: added animate keys to wml_actions.unstore_unit tables
[harm_unit]: removed two accidental plus signs that broke the tag
Fixed a missing frame in Troll Hero unit
Used slider arrows for GUI1 menu sort indicators
Removed old sort arrow images
Moved tinygui energy bar image to attic
Removed usused disabled variation images for the tristate button
Merge pull request #26 from Gallaecio/gl

Updated the Galician (gl) translation
Fix spelling in comment.
Fix spelling in comments.
Fix spelling in comment.
Merge branch 'master' of github.com:wesnoth/wesnoth-old
Changelog entries for my previous commits
Remove empty folder
Fix warden south-blade animation
ejls's vim syntax files

Source: http://forums.wesnoth.org/viewtopic.php?p=522046#p522046