Debugger: PharoDebug.log should be in sync with the basic system

[pavel-krivanek]

For Pharo, the PharoDebug.log file name is specified in SmalltalkImage>>#defaultLogFileName but in DebuggerSettings class>>#generalDebuggingSettingsOn:, this name is ignored.

Is there any reason why debugger should use another file than the one returned by SmalltalkImage current logFileName? Moreover, all the handling of PharoDebug.log looks not friendly to setup when the Pharo is started from read-only location shared by multiple users.