pointer to bool; brace position; parentheses around return; constify
a caught exception

the overview will be the documentation for the file (not for a specific
function)

also fixed usage output and doxygen description

use a tab before the keyword type.

use two tabs before the committer username.

As briefly mentioned in jabber.

I could have fixed the cross-reference spelling, but instead
I just replaced it with real explanation of the format.

This is very minor and mentioned on jabber.

Only log details of the zone being added after input validation,
when it is known the the zone pointer is non-null.  (Validation
detects null pointers and throws an exception.)

since this is just a short description, i'm pushing this straight to master

mainly to add an explanation for handle_logging_config

Also did one security-related fix; if you try to log in with a bad username or password, the message sent back is now the same (it used to send a different error depending on whether the username or password was bad)

definition of uint16_t in the boost namespace.  So avoid doing
'using namespace boost'.  Instead, import a specific name used in this file.
additional cleanups are made: be sure to include stdint.h just in case,
and remove unnecessary boost header file.

for dependent C++ libraries.

A virtual destructor was missing in src/lib/acl/loader.h
Also added a bit of whitespace for readability