Add bending line (main definition of the bending line)

C call:

C     CALL PVB440 (IN,RW,RH,RL,IT,ICL,ICT,R1,R2,R3,I1,I2,I3,BT,IRET)

C     

C     The following variables must be defined beforehand:

C     

C     IN    : Bend number (1,2,3,...)

C     RW    : Bend angle (+90.0,-90.0,...)

C     RH    : Text height for bend angle (0=auto)

C     RL    : Shifting the text (0=central)

C     IT    : Text type for the output

C             Negative = in the line, Positive = beside the line

C              100 = Bend number

C               10 = Bend angle

C                1 = Bend text

C              110 = only bend number + angle

C     ICL   : Colour for bend line (0=auto)

C     ICT   : Colour for text (0=auto)

C     R1-R3 : Addition real (currently not used)

C     I1-I3 : Addition integer

C     BT    : Bend text

C     IRET  : is not evaluated, but must be specified

C     

C     Example:

C     

C     -----------------------------------

C     BENDING-NR  1

C     -----------------------------------

C     

      IN = 1

      RW = 90.0

      RH = 10

      RL = 20

      IT = -111

      ICL = 1

      ICT = 5

      R1 = 0.0

      R2 = 0.0

      R3 = 0.0

      I1 = 0

      I2 = 0

      I3 = 0

      BT = ''

      CALL PVB440 (IN,RW,RH,RL,IT,ICL,ICT,R1,R2,R3,I1,I2,I3,BT,IRET)