Add a new autoconf paremeter --{en,dis}able-community-features .  The
default is disable for enterprise servers.

Though this is a 5.0 tree, it is only to be merged into the 5.0-community
tree and the global 5.1 tree, never to the 5.0-enterprise tree.


configure.in:
  Add a new configure parameter, --enable-community-features for community 
  features.
mysql-test/t/profiling.test:
  Add testing for whether profiling is enabled or not.
sql/mysqld.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/set_var.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_class.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_class.h:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_parse.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_prepare.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_profile.cc:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_profile.h:
  Add additional "COMMUNITY_SERVER" cpp definition test.
sql/sql_show.cc:
  Add "COMMUNITY_SERVER" cpp definition test.
mysql-test/include/profiling.inc:
  Add testing for whether profiling is enabled or not.
mysql-test/r/profiling.require:
  Add testing for whether profiling is enabled or not.