BDSBunchCircle parameter misnaming / mismeaning

[Laurie Nevay]

In BDSBunchCircle test example, the input parameters are:

envelopeX envelopeXp envelopeY envelopeYp envelopeT envelopeE

however, Y and Yp aren't used. The class has radius R throughout (setter getter methods and use in coordinate calculation). This is in its self fine, but control of y, yp would be useful.

More importantly, you have to set x and xp, which is misleading in naming for 'r'.

[Jochem Snuverink]

discussed with Laurie. Decided to change it into Filled Ellipse and use all input parameters that way.

[Jochem Snuverink]

fixed by Laurie. using envelopeR(p)