improvements to reading LAS aa.bb cc : dd lines
improvements to reading LAS aa.bb cc : dd lines

Signed-off-by: Kent Inverarity <9ddec064193bcd424e99dcb466c8980f20d1c2d3@gmail.com>

kinverarity1/lasio,kwinkunks/lasio,kinverarity1/las-reader,VelizarVESSELINOV/las-reader,Kramer477/lasio