fasttree 2.1.7: Use OpenMP

Closes #1536.

Signed-off-by: Shaun Jackman <sjackman@gmail.com>
fasttree: add 2.1.7 bottle.
ncl 2.1.18: Configure --with-constfuncs for garli

Closes #1537.

Signed-off-by: Shaun Jackman <sjackman@gmail.com>
ncl: add 2.1.18 bottle.