EFL, elementary, loaders, players and terminology - round 2

[Tomáš Čech]

Hi,

thank you for your kind review and your comments.

Changes since previous round:

- efl.scm renamed to enlightenment.scm
- descriptions are descriptive and consist of sentences with
  punctuation
- too long lines were shortened
- lonely parens made friends on previous line
- removed unnecessary input bash
- verified that Makefile.in.in substitution is really needed
- added information about reasons for propagated-inputs and improved
  the list a bit

Thanks in advance for another review round.

S_W