Reimplementation of table styles using the, now extendable, styles of MPS. Requires the commit 38131ef2b2f09db71647196c2f4fc5487c5cd60 (branch "extendableStyles" in https://github.com/slisson/MPS.git) in MPS.
style inheritance for styles on table elements
Merge branch '31_EAP1-25' into extendableStyles

Conflicts:
	languages/de.slisson.mps.tables/de.slisson.mps.tables.mpl
	languages/de.slisson.mps.tables/runtime/models/de/slisson/mps/tables/runtime/style.mps
Styles implementation updated to the latest MPS master version.
MPS Styles are now used
Origin tracing
gridquery
New grid model that supports spanning over multiple rows/columns
IGrid: alignmentShiftLeft, alignmentShiftUp
Headers in Grids. Merging doesn't work yet.
Header merging for simple cases. Tests green.
tests for annotated rows with headers
testcase for state machines with header groups
compiles
compiles
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