add convert() and reconvert() function to use for locate points when
display on screen
move eventfilter from mainwidow to drawwidget, add connect.
add wheel zoom, improve point delete
ready to change to double
OK, now the points' information is double type, and can be changed
easily
fix bugs, which will force double to int, cause big error
delete test file
perfect running move points.
make big change to use same graph process, which will more easy to find
mistake and correct.
correct many bugs in sdk RMST algrothm, now it has been corrected.