Adding method to map glyph to sym in tier glyph.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@14854 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Use map in tier glyph.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@14855 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Removing unnecessary import.

git-svn-id: https://svn.code.sf.net/p/genoviz/code/trunk@14856 80d5a9c2-7d8c-4c9f-9369-4e03bca4d2bd
Merge remote-tracking branch 'upstream'