changed: the esc key selects the entire input text now (in the input edit)
added: a test when the program is being starded which checks if the coordinates of the
main window actually pointing at the valid area (for example when someone took
his configuration file into a new computer and the new computer has a smaller screen)
added: a button 'close' on the about dialog
changed: dialogs 'add a variable' and 'add a funtion'
git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@21 e52654a7-88a9-db11-a3e9-0013d4bc506e
changed input edit: can have 2048 characters now
fixed: the focus (when using the tab key) didn't go from tabs into their controls
added: a button 'err' which shows us where is an error (an incorrect character etc.)
changed: diplaying an error message is from the main thread now
added: when the program calculates (for example the factorial) and an user clicks on the 'err' button
then a 'calculating...' message will be printed
git-svn-id: svn://ttmath.org/publicrep/ttcalc/trunk@14 e52654a7-88a9-db11-a3e9-0013d4bc506e