[daip] BPLOT fails for #IF >=29

[Vivek Dhawan]

imhead below, 40 IFs

IFs 1-16 = A1C1, 2GHz BW, 3-bit. 17-32 = A2C2, 3-bit. 33-40 = BD, 8-bit.

POSSM can show all the IFs. BPLOT gives the following message

bif 29;eif 29;go
AIPS 1: ******  VALUE =     29.0000 EXCEEDS LIMIT     28.0000
AIPS 1: ERROR IS IN VALUE OF ADVERB BIF
AIPS 1: BOUNDARY LIM


AIPS 1: Image=MULTI     (UV)         Filename=x3b861.683  .UVEVLA.   1
AIPS 1: Telescope=EVLA               Receiver=EVLA
AIPS 1: Observer=Anon.               User #= 1160
AIPS 1: Observ. date=27-OCT-2011     Map date=27-OCT-2011
AIPS 1: # visibilities    388248     Sort order  TB
AIPS 1: Rand axes: UU-L-SIN  VV-L-SIN  WW-L-SIN  BASELINE  TIME1
AIPS 1:            SOURCE  INTTIM
AIPS 1: ----------------------------------------------------------------
AIPS 1: Type    Pixels   Coord value     at Pixel     Coord incr   Rotat
AIPS 1: COMPLEX      3   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: STOKES       4  -1.0000000E+00       1.00 -1.0000000E+00    0.00
AIPS 1: FREQ        64   1.0920000E+10       1.00  2.0000000E+06    0.00
AIPS 1: IF          40   1.0000000E+00       1.00  1.0000000E+00    0.00
AIPS 1: RA           1    00 00 00.000       1.00       3600.000    0.00
AIPS 1: DEC          1    00 00 00.000       1.00       3600.000    0.00
AIPS 1: ----------------------------------------------------------------
AIPS 1: Coordinate equinox 2000.00
AIPS 1: Maximum version number of extension files of type SU is   1
AIPS 1: Maximum version number of extension files of type AN is   1
AIPS 1: Maximum version number of extension files of type FQ is   1
AIPS 1: Maximum version number of extension files of type NX is   1
AIPS 1: Maximum version number of extension files of type CD is   1
AIPS 1: Maximum version number of extension files of type SY is   1
AIPS 1: Maximum version number of extension files of type GC is   1
AIPS 1: Maximum version number of extension files of type FG is   1
AIPS 1: Maximum version number of extension files of type WX is   1
AIPS 1: Maximum version number of extension files of type CL is   4
AIPS 1: Maximum version number of extension files of type HI is   1
AIPS 1: Maximum version number of extension files of type SN is   2
AIPS 1: Maximum version number of extension files of type BP is   2
AIPS 1: Maximum version number of extension files of type PL is  20