[daip] uvplt : elevation and azimuth

[Walter Brisken]

It appears that elevation and azimuth are reversed when plotting data in 
UVPLT.   When I set

BPARM = 18, 15, 0

where the numbers indicate:

AIPS 1: BPARM      *all 0                  Control parameters
AIPS 1:                                    1 : X-axis type 0=>UV dist
AIPS 1:                                    2 : Y-axis type 0=>Ampl
.
.
.
AIPS 1:                                        15=> elevation (deg)
AIPS 1:                                        16=> parallactic angle
AIPS 1:                                        17=> uv dist. (klambda)
AIPS 1:                                             along p.a.
AIPS 1:                                        18=> azimuth (deg)

I get a curve that looks like it should be flipped across the y=x line.
(ie -- the curve representing the tracking of a source looks akin to
x = sin(y), rather than y = sin(x).  Plotting Y=amp, X=uvdist looks 
normal.

This is the case for both VLA and EVLA antennas in the database.

Data exhibiting this is on parallax, disk 1, userid 2179, file number 134 
(or any other within this test series).  A TGET UVPLT will show all my 
inputs.

-Walter