Give error when casacore is too old

[tammojan]

The travis tests using KERN all fail on a unicode error. Probably this was fixed in casacore 3.1.1, which has unicode improvements. I'll bump to KERN5 to see if it helps, but KERN5 has casacore 2.5.0 3.0.0, so probably not.

[pep8speaks]

Hello @tammojan! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file setup.py:

Line 124:9: E722 do not use bare 'except'
Line 243:1: E303 too many blank lines (3)
Line 246:43: E271 multiple spaces after keyword
Line 246:80: E501 line too long (113 > 79 characters)
Line 247:80: E501 line too long (105 > 79 characters)

Comment last updated at 2020-04-16 15:31:22 UTC

[tammojan]

I added an error to setup.py to raise an Exception when casacore is detected and the version can be extracted, but it is too old. The result is here:

RuntimeError: Your casacore version is too old. Minimum is 3.1.1, you have 2.5.0

[tammojan]

Rebased on master. I made an extension to build_ext that will crash if casacore is too old. This should make sure that setup.py can still be run to do e.g. setup.py clean. This is tested in one of the travis jobs.

[gijzelaerr]

hey! nog niet gereviewd :)

[tammojan]

Oops...

[gijzelaerr]

maar ziet er goed uit, mooi zerk. volgens mij zou dit wel moeten werken. laten we zien wat er gebeurt tijdens packagen.