Correct RadMon README and html install scripts

[EdwardSafford-NOAA]

The tranfer.sh script uses rsync to transfer files to emcrzdm. It initially fails because the target directory does not initially exist on emcrzdm when a new web site is set up. This needs to be noted in the README instructions and, if possible, fixed in the install_html script.

Example error output from failed transfer:
rsync: mkdir "/home/people/emc/www/htdocs/gc_wmb/acollard/radmon/v16.3.8_hires/pngs" failed: No such file or directory (2)

Additionally the README should be updated to reflect that password free access to emcrzdm is possible from systems other than wcoss2.

Also, the check on MY_MACHINE occurs too early in the script and fails as a result. This isn't an issue when run via the plot script, but is a show stopper when run separately.

Lastly, make the rsync transfer from ${TANKimg} not ${TANKimg}/pngs in order to pick up the html files above pngs.

[EdwardSafford-NOAA]

1. Directory creation issue has been addressed in File transfers from hera don't work #92.
2. MY_MACHINE check was re-positioned at some point and now no longer fails if run apart from the plot script.
3. Transfer from hera is now automatic in File transfers from hera don't work #92 .
4. README has been updated in File transfers from hera don't work #92 .
5. Rsync transfer source has been addressed in File transfers from hera don't work #92 .

[EdwardSafford-NOAA]

All issues addressed in #92 , closing this issue.