Improve conversion to latex of output cells...
Improve conversion to latex of output cells
Improve the latex convert possibilites of pyout and display_data cells.
Detailed changes:
- set display_data_priority for latex output to start with 'latex'
- use numbered equations
- define relative figure size instead of absolute
- specify image file position relative to input file position
- pyout.text is only rendered if latex representation is not available
- place display_data_format_latex output in equation environment
- some minor code clean-up
