Always allow PHASE CONTROL APDUs.

When creating a DF, make it so that PHASE CONTROL APDUs are always allowed.
This is needed for isonomy (from libopensc's perspective) with the CardOS 4
driver. Unlike CardOS 4, in CardOS 5 such APDUs are forbidden by default.
Use 65537 as the public exponent for RSA keys.

This fixes spurious errors in the creation of 2048-bit RSA keys which
were being observed every third of fourth attempt. Tested by generating
~2k keys overnight in a loop.