man page export: missing subcommand name

[mr-c]

Also, the name of the executable in the NAME section should not be capitalized (even for non-subcommands)

Currently for raptor build --print-help man starts with

RAPTOR(1)                                                                                                                                                      RAPTOR(1)

NAME
       Raptor - A fast and space-efficient pre-filter for querying very large collections of nucleotide sequences.

instead of

RAPTOR-BUILD(1)                                                                                                                                RAPTOR-BUILD(1)

NAME
       raptor-build - A fast and space-efficient pre-filter for querying very large collections of nucleotide sequences.