Permission error writing log file after install

[phunkyg]

When source is downloaded from github, it omits a 'log' subdirectory and the permissions on same mean it is not ready to be written to.

[phunkyg]

Fix is proposed as codeline per DEV_Tempfiles branch.
This uses platform independent seek for temp directory and uses that for logging instead.

[phunkyg]

Workaround: After extracting the source code, create a subdirectory 'log' and set permissions to read/write for all users.