ERT-673: Fixed bug in matrix_diag_std()
ERT-672 Disable export button if no keywords found to export
Merge pull request #534 from joakim-hove/ERT-673-matrix-diag-std

ERT-673: Fixed bug in matrix_diag_std()
Introduced a new fs pointer, to separate reading fs and writing fs for active_list.
Merge pull request #535 from iLoop2/ERT-674

ERT-672 Export bug: missing realisations?
Merge pull request #536 from flikka/ERT-667-segfault

Introduced a new fs pointer, to separate reading fs and writing fs for a...
Merge remote-tracking branch 'upstream/master' into ERT-652

Conflicts:
	devel/python/python/ert_gui/tools/export/export_tool.py
ERT-652 Fix after merge