Allows Tesseract PSM up to 13

[rferreira]

This also includes allowing mode 0 which was previously not matched by the regex
Changed wording on exception to clearly reference page segmentation

[rferreira]

For context on supported PSM (mode 11 works particularly well for us):

$ tesseract --version
tesseract 3.05.00
 leptonica-1.74.1
  libjpeg 8d : libpng 1.6.29 : libtiff 4.0.7 : zlib 1.2.8

$ tesseract --help-psm
Page segmentation modes:
  0    Orientation and script detection (OSD) only.
  1    Automatic page segmentation with OSD.
  2    Automatic page segmentation, but no OSD, or OCR.
  3    Fully automatic page segmentation, but no OSD. (Default)
  4    Assume a single column of text of variable sizes.
  5    Assume a single uniform block of vertically aligned text.
  6    Assume a single uniform block of text.
  7    Treat the image as a single text line.
  8    Treat the image as a single word.
  9    Treat the image as a single word in a circle.
 10    Treat the image as a single character.
 11    Sparse text. Find as much text as possible in no particular order.
 12    Sparse text with OSD.
 13    Raw line. Treat the image as a single text line,
			bypassing hacks that are Tesseract-specific.

[rferreira]

hey folks, any thoughts on this PR?

[tballison]

I'll put this in this morning. I want it in Tika 1.15. Thank you!

[dameikle]

Hi @tballison - was about to do this, shall I stop?

[tballison]

Er, please do add it. Thank you!

[dameikle]

Merged in 0aaa121

Thanks Rafael!