modify method name calcPermission to chekcCalculatedPermission

modify permission check logic about custom permission ( if true, then return immediately)
fix: does not clear user entries from user_table
show group permission to Nemakishare (in progress)
add group select UI to set permission dialog
fix enable search groups by keyword
fix permission check about subgroup users
Merge pull request #22 from NemakiWare/topic_fx

fix several bugs