check for leptonica version; add info to tesseract.pc about opencl lib if needed

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@1035 d0cd1f9f-072b-0410-8dd7-cf729c803f20
C-API: add function to set init parameter during Init with c-string array

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@1036 d0cd1f9f-072b-0410-8dd7-cf729c803f20
provide output for -psm 0

git-svn-id: http://tesseract-ocr.googlecode.com/svn/trunk@1037 d0cd1f9f-072b-0410-8dd7-cf729c803f20