add install information for Arch Linux
Update INSTALL.md

- moved gcc compilation instruction into separate Gist
Merge pull request #409 from slizzered/add-archlinux_install_info

Add archlinux install info
Merge pull request #403 from f-schmitt-zih/topic-consistentDomainNames

Topic consistent domain names
Close #381 Meta Information in Phase Space

Uses m_species * c to scale output for now.
(Previously it scaled by the electron mass.)

New Attributes:
  - exclusive offset of the global moving window
    if the spatial dimension is == y
  - [p_min;p_max] + unit
  - dr + unit (spatial dimension)
  - dt + unit (time step)
Remove Left Over Debug Message
Fix Units
simBox -> DomainInformation, namings spatial size/offset