Updated docs, texmf, added modem

  * docs/scripts/misc.org: reformat a paragraph;
  * feh/fehbg: added a space at line end;
  * texmf/web2c/texmf.cnf: changed path for journal styles (user set
    TEXMF tree);
  * modem: moved here wvdial and added subdirectory 'ppp' for settings
    (and temporary notes) of USB modems (3G and GSM).

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>