Documentation should be clearer about supported emulators and folders

[milnak]

according to /root/databases/emulators.conf the following folders and emulators are supported.

arcade;mame2003_plus_libretro.so mame2003;mame2003_libretro.so mame2003plus;mame2003_plus_libretro.so mame2000;mame2000_libretro.so atari2600;stella_libretro.so coleco;fbalpha_libretro.so fbneo;fbneo_libretro.so gamegear;genesis_plus_gx_libretro.so gb;gambatte_libretro.so gba;mgba_libretro.so genesis;genesis_plus_gx_libretro.so lr-fbalpha;fbalpha_libretro.so mastersystem;genesis_plus_gx_libretro.so megadrive;picodrive_libretro.so msx;fbalpha_libretro.so n64;glupen64_libretro.so neogeo;fbneo_libretro.so nes;fceumm_libretro.so nestopia;nestopia_libretro.so null;mednafen_psx_libretro.so pce;mednafen_pce_fast_libretro.so pcecd;mednafen_pce_fast_libretro.so psp;remotejoy_libretro.co psx;pcsx_rearmed_libretro.so segacd;genesis_plus_gx_libretro.so sg1000;fbalpha_libretro.so snes;snes9x2010_libretro.so spectrum;fuse_libretro.so supergrafx;mednafen_supergrafx_libretro.so

So, for example, for MAME it should be documented that the following sets can be used:

• arcade or mame2003plus folder: mame2003_plus (ROM set: MAME 0.78-MAME 0.188)
• mame2003 folder: mame2003 (ROM set: MAME 0.78)
• mame2000 folder; mame2000 (ROM set: MAME 0.37b5)