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name            tmppic  --  Allocate temporary picture

synopsis        ch = tmppic(fld,picchr);
                TEXT ch;    returns pointer to temporary picture
                TEXT fld;   field that needs temporary picture
                TEXT picchr; Fill picture with this character.

description  This builds a temporary picture if the input field
           has a NULL for a picture. The function will result
           in a terminal error if there is not enough memory
           to allocate the picture.