Many changes, read description

ExportLog.cs
-Choose whether or not to write system specs and/or uptime in addition
to the log

MainForm.cs
-Makes perfUptimeCount public, for access by logs
-Removes log writing from this class
-Adds a default file name to the SaveFileDialog

Program.cs
-Checks operating system version on startup, if it registers as Windows
XP or lower, the program exits. We will not be able to support Windows
XP

README.txt
-Writes a FAQ/Readme in the same directory as the Jarvis20.exe, for
packaging

SystemSpecifications.cs
-Dedicated class for collecting system specifications