Cannot create runtime properties during first installation - TRUNK-4320
TRUNK-4109: Get observations by accession number

org.openmrs.api.ObsService#getObservations and
org.openmrs.api.ObsService#getObservationCount are now overloaded to support
specification of accession number.
If specified, only observations (or their count) with matching accession
number are returned.

See https://issues.openmrs.org/browse/TRUNK-4109

Unit tests for org.openmrs.api.ObsService#getObservations and
org.openmrs.api.ObsService#getObservationCount now use the new
(and most general) methods.
Ignoring another dwr-modules.xml
Merge pull request #959 from vencik/master

TRUNK-4109: Get observations by accession number
Merge branch 'master' into hibernate-search

Conflicts:
	api/src/main/java/org/openmrs/util/OpenmrsUtil.java