* libamu/xutil.c: make xlog_level static, and initialize it to

* libamu/xutil.c: make xlog_level static, and initialize it to
XLOG_DEFAULT.
(cmdoption): take unsigned int as flags argument, and print any
errors as XLOG_ERROR (which cannot be turned off).
(switch_option): remove old code which disallowed you from turning
off flags that were set when Amd started up.  Now, you can turn
any log option on/off at start time or later on (via amq -x),
other than the two mandatory options (fatal+error).

* include/am_utils.h (XLOG_*): remove unused XLOG_DEFSTR.  Define
XLOG_MASK to mask out unused flag bits.  Define XLOG_DEFAULT to be
what it was before (fatal + error + user + warning + info), but
use the new mask.  Remove extern's for xlog_level and
xlog_level_init.  Change extern for cmdoption() to take an
unsigned flags argument.

* doc/am-utils.texi, amq/amq.8, scripts/amd.conf.5, amd/amd.8:
document mandatory log options
(fatal+error) which cannot be turned off and are always on by
default.  They must be on so that Amd can report crucial errors,
including those related to setting flags on/off.

* hlfsd/hlfsd.c (main): remove hack to initialize log_options.

* wire-test/wire-test.c: remove reference to unused xlog_level.

* amd/mapc.c (mapc_create): 'alloc' flags variable should be
unsigned.

* amd/get_args.c (get_args): no need for hack using
xlog_level_init.