Implement method getGroupSubjects for ExtSourceXML

- use group attribute groupMembersQuery for searchString
Merge pull request #274 from stavamichal/addMethodGetGroupSubjectsToXMLExtSource

Implement method getGroupSubjects for ExtSourceXML
GUI: fixed user detail from perun admin view

- Fixed passing user to change password dialog trigerred from user detail page (perun admin section)
- Make content of "Certificates, Logins, Passwords" scrollable in case there is a lot of certificates etc.
Merge pull request #275 from zlamalp/pass

GUI: fixed user detail from perun admin view
GUI: fixed app form alignment
Merge pull request #276 from zlamalp/form

GUI: fixed app form alignment
Fix regexp in ExtSourceXML.java

Fix and simplyfy regexp for serching for end of regexp from
configuration file.

Old regexp was designed with assumption that escape character in regexp
is '/' instead of '\'.
Allow other parameters in URL.
Merge pull request #277 from tauceti2/vootFixParams

Allow other parameters in URL.