fastx-toolkit 0.0.14

No longer fails to build with clang.

Closes #601
R: added cairo dependency

Closes #587, closes #613.
Armadillo: update to 4.000.0

Closes #614.
Merge commit '499995ff8d0b0ca3ff19085d928c93c8968aec46'
Removed support for —HEAD; the tip fails to compile with clang.
Cleaned up spacing.