AFS3 Client Capabilities

Obtain client capabilities by calling RXAFSCB_TellMeAboutYourself.

AFS3 service capabilities are identified by small numbers.  The
GetCapabilities calls (and RXAFSCB_TellMeAboutYourself) represent
capability information as a vector of 32-bit integers.  The first
value in this vector holds a bitmask representing the first 32
capability codes, with the low-order bit representing capability 0.
Presently, the format of the remaining integers is undefined, and
there is no way to represent capabilities 32 and above.

  Code  Capability                      Contact/Source
======  ==============================  ==============================
     0  ERRORTRANS                      jaltman (#24396)
     1  EXT_CALLBACK                    matt (#124161)
     2  -available-
     3  -available-
     4  -available-
     5  BYTE_RANGE_LOCK                 matt (#127319)
 >= 32  RESERVED pending protocol revision