Merge pull request #267 from stavamichal/vosShortNameFrom16To32CharsLong

Increase length of shortName by Vo from 16 characters to 32 characters.
Merge pull request #268 from zlamalp/voshortname

GUI: Vo's short name 16 -> 32
Merge pull request #273 from stavamichal/newExtSourceForXmlVoms

Add new ExtSource for XML.