[wxsig] T238+ 1.15.3 Release

[William Beals]

Folks:

I violated one of my own rules for the 1.15.2 release and did not do a days
worth of testing on it before releasing it.  There was a problem with the
gust reporting.  That is fixed in the 1.15.3 release on the website.

I also updated the debug screen to only show humidity or AAG data if those
sensors are installed.  If not, only dashes are shown.

will

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Will Beals