ipdf with portrait column support
=================================

These patches add a new column mode in addition to the page/contineous modes in
portrait view to ipdf irex rev 25 / stock 2.11.

Please note that a pdf does not specify anything regarding textwords / lines /
columns / flows. The poppler library, that is used by ipdf to render pdf files,
has a textoutput device that makes use of a number of heuristics to determine
words, lines and columns. This textoutput device is also used in the poppler
tool pdf2text.

With a small interface adjustment in poppler (poppler.patch), ipdf can query
poppler about rendered text columns. This is the basis for the column mode in
ipdf (ipdf.patch).

Features:
- "column mode" icon is hidden under page/contineous mode when in portrait view
- Works best when zoomed in on a (set of) columns
- Short flipbar next/previous = move to next/previous column
- Long flipbar next/previous = move to next/previous page; first/last column
- Tap on column = move to tapped column
- Columns that are completely in view are skipped over when considering
  next/previous column. This allows you to read an entire portrait page before
  flipping, instead of flipping for each column individually.
- Current column is identified using a black rectangle; note that you can
  configure this away in the source. I left it in to allow ppl to see in what
  order columns are identified and processed.
- Extensive logging; try ipdf-nologging or configure the source to remove them.
- Column mode and current column are saved and loaded in manifests.

How to try:

Included are a ipdf and an ipdf-nologging. These arm binaries have the modified
poppler library linked in statically, i.e. you can give this a go by copying it 
to /usr/bin/ipdf.

When using ipdf, try

/sbin/syslogd -s 500 -b 0 -O log

and take a look at the file 'log' to see what it is doing.