Simplify the compute signature operation and add warning
Fix for PTEID's PKCS#15 emulation breakage
Remove redudant check
Fix eidenv manual page: -n is actually -p
Fixed gen_key to expect the proper PIV Key references.

0x9B is defined as the Card Management Key, and probably shouldn't be
regenerated.  0x9E is the Card Authentication key which is what you
should be generating keys for.  This also brings piv-tool in line with
the documentation that states 0x9A, 0x9C, 0x9D and 0x9E are the proper
keyIds to use.
Merge pull request #156 from poupas/master

Fixes for the PTEID card
card-ias: fix code style to be MS C89 compliant.
Merge pull request #158 from cbancroft/fix-piv-tool-gen_key

Fixed gen_key to expect the proper PIV Key references.