Environment variables should be substituted for history settings

Current Situation

• Specifying an absolute path for the JADE history file is reported to work:

  [globals]
  history = /home/sos/sos-berlin.com/jade_client/history/jade-proxy-history.csv

• When adding environment variables to this path then they are not substituted and JADE will not create and write to the history file:

  history = $HOME/sos-berlin.com/jade_client/history/jade-proxy-history.csv

Desired Behavior

• The history setting should support substitution of environment variables

Resolution

• JADE substitutes environment varialbes that are specified with the syntax

  history = ${HOME}/sos-berlin.com/jade_client/history/jade-proxy-history.csv