Internal function to read an 'ACER ConQuest' system file. Called by conquestr::ConQuestSys.
ReadSys(myFile, isMini)
Arguments
myFile: An connection to an 'ACER ConQuest' system file created by the put command in 'ACER ConQuest'. If the file is compressed, and uncompressed temporary file is created.
isMini: A boolean, set to TRUE if the system file is a mini system file created by 'ACER ConQuest' command put with option "mini = yes".
Returns
A list containing the data objects created by 'ACER ConQuest'.