The following webpage suggests that it is possible to unignore files/folders with TortoiseSVN by right-clicking the file/folder and select "remove from ignore list". I do not have this option as shown below:
Also what is the difference between "Unversion add to ignore list" and "Unversion add to ignore list (recursive)"? I have read on here that "Unversion add to ignore list (recursive)" ignores all files/folders in the tree, but in my experience "Unversion add to ignore list" does this as well.
svn pg -R svn:ignore .
– Rector