Remove modelines

Removed modelines are better than modelines that differ from file to
file.
Configure travis to use prebuilt dependencies

Dependencies are now hosted in a github repository and this brings two advantages:

- Improved build time with travis since we no longer have to build each
  dependency
- Less chance of build errors due to external servers being down since Github is
  now the single point of failure
Remove 'textmode' option

'textmode' is an option obsoleted for at least 10 years in favor of
'fileformat'.