Returns the number of lines in the specified file
_FileCountLines ( $sFilePath )
|$sFilePath||Path and filename of the file to be read|
|Success:||the number of lines in the file.|
|Failure:||0 and sets the @error flag to non-zero.|
|@error:||1 - File cannot be opened or found.|
It does not count a final @LF as a line.