o.c.o.converter: more sensible handling of symbol sizes
Prevented erroneous drawing calls from creating exceptions
Revert "EDM Mode: add symbol number as property of symbol widget"

This reverts commit 88877d24d23f2c8c76e01cd2baac7768904642c4.

Conflicts:

	products/DLS/plugins/org.csstudio.opibuilder.widgets.edm/src/org/csstudio/opibuilder/widgets/edm/editparts/EdmSymbolEditpart.java
Use pv_value as handle for which widget is shown

Updating the widget status based on pv_value is consistent with all
other CSS widgets.
Removed references to symbol_number
o.c.o.converter: improve handling of precision

in TextUpdate and TextEntry.
Merge branch 'converter'
Merge branch 'css-33'
Merge branch 'converter-edm'
Prevents issue where o.c.opibuilder could not be started when run from IDE