Update statistics output

The parameters stored in the statistic output have been extended, including 6D beam (sigma) matrix (OPAL/src!594 (merged)) and temperature, Debye length, plasma parameter and RMS number density (OPAL/src!561 (merged))

added Add/modify Doc label

marked this issue as related to OPAL/src#729 (closed)

marked this issue as related to OPAL/src#737 (closed)

mentioned in commit 02821b49