Reduce size of advanced expression editor

The editor text area can be enlarged by dragging the lower left corner, so it is still possible to get a larger editor if desired.
Remove confusing word "Parse" from warning title
Merge pull request #176 from dimagi/76731-errors-and-warnings

Remove confusing word "Parse" from warning title
Merge pull request #175 from dimagi/90767-xpath-editor-size

Reduce size of advanced expression editor
Make Label textbox resizable

NOTE this also makes it possible to enter mutliline label text, which is a useful side effect.
Merge pull request #179 from dimagi/104234-resize-label

Make Label textbox resizable
remove unused stuff
remove user facing "vellum"
Merge pull request #180 from dimagi/dead-code

remove unused stuff
Merge pull request #181 from dimagi/cz

remove user facing "vellum"
automatically rename question IDs whenever there is a conflict

+ a tiny bit of formatting cleanup
Merge pull request #182 from dimagi/slimer

automatically rename question IDs whenever there is a conflict
Revert "Merge pull request #179 from dimagi/104234-resize-label"

This reverts commit faa13905b659b1870079599454db07780e4f409b, reversing
changes made to a660df61c2fe3d5290abc6ea0b697efca3880df2.
Merge pull request #183 from dimagi/revert

Revert "Merge pull request #179 from dimagi/104234-resize-label"
actually increment the counter
Merge pull request #184 from dimagi/slimer

actually increment the counter
Merge branch 'master' into develop

Conflicts:
	src/js/model.js