Differences

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+====== Known problems ======
+===== Fonts in PDF (PS, PNG) export do not match original or non-ASCII letters are mangled =====
+Here I copy a reply to one user who reported this problem to make it available to others:
+<code>
+I have had a look at the problem you reported. As I was afraid, it is a
+problem caused by different handling of fonts in Tkinter (the library
+that BKChem uses to display windows) and Cairo (the library used for PDF
+export). These two libraries have separate ways of finding fonts and it
+sometimes happens that they find a different one for the same name or
+that Cairo cannot find that font at all and uses some replacement. It
+can then happen that the font looks slightly different or that some
+non-ASCII letters disappear or a replaced by some other strange symbol.
+I am sorry but there is not much I can do about it. The only way is to
+try to change the font (I was successful with Arial) and re-try the export.
+</code>