Add period to the end of a sentence
Fix a few grammar mistakes in readme
Fix grammar mistakes in testcase names
Add info about the invertibilty of step over to the help
Improve mdb's reevaluation section in README
Sync readme and built in help
Add section about step over to tutorial
Reintroduce 'Not in any release yet' section in changelog
Fix spelling in README
Add iface::displayer and iface::console
Merge remote-tracking branch 'r0mai/master'

Conflicts:
	test/test_mdb_continue.cpp
	test/test_metaprogram.cpp