update root to v5.30.01

[cjones051073 (Chris Jones)]

Update root version to 5.30.01

This version builds natively on OSX 10.7, without the need to resort to a gcc variant.

Also adds a python27 variant.

Note : Due to a flaw in the root configure script, the only variant that works on OSX10.6 is python26, whereas on OSX10.7 only python27 works. For more details see

​https://trac.macports.org/ticket/31119

I'm in discussion with the ROOT devs on this.

However, given this a) fixes non-gcc variant compilation on OSX 10.7 and b) provides a working python variant for both OSX 10.6 and 10.7, I think it is worth submitting now ?

Chris