[PATCH 0/2] Use zuinteger_unlimited

[Yao Qi]

These two patches are to change commands to use zuinteger_unlimited,
as these commands are fit to zuinteger_unlimited command.

These two patches were original posted in this series as 2/3 and 3/3,

  [RFC 0/3] New var_types var_zuinteger_unlimited
  http://sourceware.org/ml/gdb-patches/2012-08/msg00020.html

during the review, I decided to post patch 1/3 together with other
changes here,

  [RFC 0/3] Get rid of var_integer in CLI
  http://sourceware.org/ml/gdb-patches/2012-08/msg00364.html

this series was approved by Tom and committed.  It is time to revisit the
patch 2/3 and 3/3 again.  I rebase them on the latest CVS trunk and
update changelog entry a little.

Regression tested on x86_64-linux.  Is it OK?

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1.7.7.6