detect location of snapraid

[simonmcnair]

Is your feature request related to a problem? Please describe.
depending on if you install from apt or repo snapraid will be installed to different locations.

Describe the solution you'd like
it would be nice if the location of snapraid binary could be dynamic. You could look in frequently used binary locations or use 'locate snapraid'

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

[auanasgheps]

Completed! Available in dev branch!