Merge pull request #1008 from maieul/master

Add rules for TeX packages (e)ledmac and (e)ledpar. References from manuals:

eledmac p. 46:

Each section will read and write an associated "line-list file", containing information used to do the numbering; the file will be called <jobname>.nn, where nn is the section number. However, you may direct that an extra string be added before the nn in that filename, in order to distinguish these temporary files from others: that string is called \extensionchars. Initially it's empty, since different operating systems have greatly varying ideas about what characters are permitted in file names. So \renewcommand{\extensionchars}{-} gives temporary files called <jobname>.-1, <jobname>.-2, etc.

eledmac p. 112:

Endnotes of all varieties are saved up in a file, typically named <jobname>.end.

eledpar p.8:

The \beginnumbering macro resets the line number to zero, reads an auxiliary file called <jobname>.nn (where <jobname> is the name of the main input file for this job, and nn is 1 for the first numbered section, 2 for the second section, and so on), and then creates a new version of this auxiliary file to collect information during this run. Separate auxiliary files are maintained for right hand texts and these are named <jobname>.nnR, using the ‘R’ to distinguish them from the left hand and serial (non-parallel) texts.