move Eclipse project files to old Java sources

--HG--
rename : .classpath => orig-java/.classpath
rename : .project => orig-java/.project
tests: add images-expected/ subdir, based on current build
re-formatted with Eclipse "Clean up" tool
java: add lacking import paths
java: simplify: remove 'html' option and code
java: small code compacting
java: factor out 'splitLines' and 'readLines' methods
java: factor out some methods (recode, findMaxWidth)
java: factor out constant BLANK_BORDER_SIZE
java: improve fixTabs(), factor out removeBlankBottomRows()
java: factor out padWithSpaces()
java: simplify some code around isBullet()
java: some more cleanup, also using Unused Code Detector
java: remove unused DocBookConverter, to simplify
java: fix some containers and iterators to typed
java: tiny formatting improvements
java: simplify definitions of GridPattern criteria
java: started extracting GraphicalGrid + done some global reformatting
java: typed some iterators
java: use GraphicalGrid in many places instead of Diagram