Merge branch 'master-v2'

* master-v2:
  [UIMA-6207] Allow setting number of threads in CpePipeline
  [UIMA-6206] Parameter values with certain non-XML 1.0 characters not supported
  [UIMA-6204] createReaderDescription does not discover type priorities

# Conflicts:
#	uimafit-core/src/test/java/org/apache/uima/fit/factory/TypePrioritiesFactoryTest.java
#	uimafit-cpe/src/main/java/org/apache/uima/fit/cpe/CpePipeline.java