Better way to indent gmt examples: use "if gmt"

[jidanni]

In e.g., the cookbook, we often see examples indented like

gmt begin GMT_-R
	gmt set GMT_THEME cookbook
	gmt set MAP_FRAME_TYPE PLAI
        ...
gmt end show

Well, I have found a way to achieve similar indentation, that is
consistent with all shell script formatters. My new indentation method
can survive multiple runs through such pretty programs intact.

The above should be rewritten:

if gmt begin GMT_-R
then
   	gmt set GMT_THEME cookbook
	gmt set MAP_FRAME_TYPE PLAI
        ...
        gmt end show
fi

In fact my solution is so brilliant I think the entire cookbook should
be rewritten using it!

Tested with emacs' Shell-script mode using C-x h TAB.

Anyway: no need to teach the formatters anything special. It just works. Also it is good for you:
yes, you could do "set -ue" to catch more errors, but if gmt fails, there is no point
it is just plain dangerous doing the stuff between the then...fi anyway.

[joa-quim]

if gmt begin GMT_-R
then

Absolutely NO WAY. GMT scripts are supposed to run on Windows as well.