SQuirreL is updated to Sourceforge Allura

SQuirreL is updated to Sourceforge Allura.

The most important changes are the new SVN repository URLs:
To checkout SQuirreL from subversion use the command:
svn checkout svn://svn.code.sf.net/p/squirrel-sql/code/trunk/sql12
or
svn checkout http://svn.code.sf.net/p/squirrel-sql/code/trunk/sql12

Registered developers should use:
svn checkout --username=<SF user name> svn+ssh://<SF user name>@svn.code.sf.net/p/squirrel-sql/code/trunk/sql12