Initialize tableiterator in assignment like in constructor, cherry-pick 

1292ba4

Merge pull request casacore#656 from tammojan/testnamespace

Use casacore namespace in travis

Merge pull request casacore#595 from tammojan/master

Prepare for release 2.3

Merge pull request casacore#547 from casacore/issue546

Ambiguity in using pow function

Merge pull request casacore#335 from casacore/prepare210

Prepare for v2.1.0

Merge pull request casacore#186 from casacore/release-2.0.3

Release version 2.0.3

prepare for 2.0.1

I will name the debian package casacore2

Tag 1.7.0 release

Tagged last release before merge from NRAO branch.