make a mock ga function when in dev mode

and remove the ga undefined check from ga_track_event
make ga-tracked links respond to meta-click
fix View Source Files link behavior

expand gaTrackLink to allow delegating selectors
in addition to actual jquery objects
follow clicks even when ga is inaccessible
remove extra space in invoicing
fix typo in docstring
CMR - fixes in the report printing version
Update submodules
Merge pull request #4909 from dimagi/gaTrackLink-rebase

Make ga-tracked links respond to meta-click
update staging.yaml

[ci skip]
Merge pull request #4927 from dimagi/fix-typos

Fix typos
remove -1 from SMS line item in invoice for enterprise plans
do not invoice subscriptions upgraded from non-enterprise to Dimagi enterprise
add disable-on-submit to exchange view
add clarifying text about languages not affecting mobile apps

http://manage.dimagi.com/default.asp?148698
Switch single select questions to be represented as one column, rather than a column for every option in the select.
extend fluffs to support product code
Merge branch 'master' into ih_product_code
refactored SQLdata models to support grouping by product_code
pull out migration-related styles into separate file so that core styles can be used in new static site