Fix incorrect region number counting in regions_pyregi…

[leejjoon]

in dev/regions_pyregion_comparison.py, the number of regions are calculated by counting the occurence of "(". This overestimates for the following cases

panda(18:13:25.141,+31:21:31.32,51.8442,90.2623,1,0",4.995",1) # panda=(51.8442 90.2623 180.262 270.262)(0" 4.995" 9.99") text={Panda 2}

The patch only counts "(" not preceded by "=" or ")".

[keflavich]

Thanks for noticing this. I was trying to find an example where overcounting would happen and I didn't see any in the test data we had, but this would also be a problem for any region with ( in the text={} box.

[leejjoon]

Yes, the proposed change can still count "(" in the text box. But as far as the coverage test is concerned, none of them has this.