Skew function implemented
ArrayMAthTest created
Skew function modified to use luminance
Preliminary versions of Bimage scale and rotate functions
Minor changes
Bug in Bimage.rotate function solved
Minor changes
Added support for user.properties file
New class WarningException generates warnings for user which can keep the program waiting for new input
Linear time distanced implemented (character level and word level)
Linear time distanced implemented (character level and word level)
Merge origin/unstable into unstable

Conflicts:
	src/test/java/eu/digitisation/distance/EditDistanceTest.java
MinimalPerfectHash moved to Math package
Additional JUnit tests for distances
Aligner.alignment creates alignment based on new (approximate) distance function
Problems in XPathFilter when reading multiple inclusion expressions (probably due to self modification of NodeList)
Problem with XPathFilter solved (NodeList changed to ElementList)
Problem with XPathFilter solved (NodeList changed to ElementList)
Weight for basic edit operations (new interface  EdOpWeight) are now used by EditDistance.
Weight for basic edit operations (new interface  EdOpWeight) are now used by EditDistance.