[x265] x265_atobool & parseName

[dave]

x265_atobool is made to process boolean cli options as --<option> 
<yes,true,1 || no,false,0> which currently no option is setup for in 
long_options[].  Currently, it is setup for boolean cli options in the 
form of --[no-]<option>.  Which form do we want?  Both?

By passing bError to parseName then to x265_atoi and setting it a less 
informative error message is generated than x265_check_params would 
generate.  It looks like bError is intended for a bad cli option and not 
a bad argument.  I would like to remove the use of bError in parseName, 
x265_atoi and x265_atof and let x265_check_params do its job. Unless 
anyone objects.