Use CRegExp trait for regular expressions.

[bfroehle]

Now that we have this CRegExp trait, I suppose we should use it.

I've searched through the source and identified a few instances of configurable regular expressions in parallel/apps/launcher.py.

One immediate benefit is that IPython now validates the regular expression at config time instead of when the value is first used.

[minrk]

Makes perfect sense, thanks. I don't see how this could fail, but these are not tested quantities, so I will try to run some tests in deployment over the next few days (and possibly try to write some automated tests).

[minrk]

Works in my basic PBS/SGE environments, so merging away, thanks!

[minrk]

Test results for commit 5ba8058 merged into master
Platform: darwin

• python2.6: OK (libraries not available: matplotlib pymongo qt tornado wx wx.aui)
• python2.7: OK (libraries not available: wx wx.aui)
• python3.2: OK (libraries not available: matplotlib pymongo qt wx wx.aui)

Not available for testing: python3.1

[minrk]

Test results for commit 5ba8058 merged into master
Platform: linux2

• python2.7: OK (libraries not available: pymongo wx wx.aui)
• python3.2: OK (libraries not available: matplotlib pymongo qt wx wx.aui)

Not available for testing:

[minrk]

Test results for commit 5ba8058 merged into master
Platform: linux2

• python2.7: OK (libraries not available: pymongo wx wx.aui)
• python3.2: OK (libraries not available: matplotlib pymongo qt wx wx.aui)

Not available for testing: