Merge pull request #53 from jpahullo/issue19

Issue #19 - quiz attempts addressed for merging
Update deprecated icons
Merge pull request #54 from MorrisR2/master

tool_mergeusers: Simplify and correct getCurrentUserFieldNames()
Merge pull request #55 from MorrisR2/update_deprecated_icons

Update deprecated icons
moodle-tool_mergeusers : removed debug line on MergeUserTool.
Merge pull request #56 from jpahullo/forgotten_debug

moodle-tool_mergeusers : removed debug line on MergeUserTool.