link handling + scale

more information on demo page:
  - showing pdf2htmlEX home page
  - link to other demos
  - browser requirements

page idx vs no
tracking current page
more js annoatation
pdf:mobile device
pdf:miui
tmp dir: use pid
remove page from dom -- UI option
view hash
- store a separate map/dict for 'original' page number
- OR adjust all destinations

issue: separate CSS?
key handler on $container instead of window?
fix get_next/prev_page
next/prev for each Page ?

 - dots issue
  - AdobeXML*.pdf
 - font issue 
  - cjkmix2*.pdf
 - space issue
  - python简明*.pdf
 - fix negative word-spacing for IE

== Future: ==

Too difficult/complicated to implement:
 - reflowable text/combine lines/unwrapping
 - multi-thread

Not enough motivation/Lazy
 - commandline argument auto-completion
 - use absolute positioning for long whitespace
 - detect duplicate base fonts when embedding
 - disable selection if we know unicode is wrong
 - check if we can add information to the font, and let browsers show ligatures automatically
 - position history stack (popstate)
 - draw non-orthogonal lines with CSS
 - precise link destination: zoom
 - multiple charcode mapped to a same glyph
 - minimum line width of css drawing
 - separate classes for annotations (such that we don't have to hide all css drawings for printing)
 - Widget Annoataion
 - handle large negative letter space
 - optimization levels