Fixes the remaining test in test/db/cmd/cmd_c on big endian hosts,
tested on OpenBSD/sparc64.
The mask calculation was removed because it was unnecessary (only
comparing selected bytes anyway) and wrong by a factor of 8 (bits vs.
bytes confusion).
* pd + pda[jJqi=]
* Added pdb/pdC/pdf/pdk/pdl/pdp/pdr and removed pdi in favour of pdq
* removed pdx since is an alias for 2 other commands.
* Added pdR and pds[fb]
* Added example and fixed bug when cw
* Removed pdx test file since it is the same as cmd_pix