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* acts as a safe-guard against uninterrupted infinite loops
or other operations that are costly to undo in interactive mode.
If we're out of memory, it is usually too late to react properly.
This implementation tries to avoid OOMs due to SciTECO behaviour.
We cannot fully exclude the chance of an OOM error.
* The undo stack size is only approximated using the
UndoToken::get_size() method.
Other ways to measure the exact amount of allocated heap
(including size fields in every heap object or using sbrk(0) and
similar) are either costly in terms of memory or platform-specific.
This implementation does not need any additional memory per heap
object or undo token but exploits the fact that undo tokens
are virtual already. The size of an undo token is determined
at compile time.
* Default memory limit of 500mb should be OK for most people.
* The current limit can be queried with "2EJ" and set with <x>,2EJ.
This also works interactively (a bit tricky!)
* Limiting can be disabled. In this case, undo token processing
is a bit faster.
* closes #3
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* added platform-dependant file_is_visible() function
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* EW can save Q-Registers now
* the new E% may be used to save a q-register without making it
the current document
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this will allow us to use the same algorithms for loading and saving
Q-Registers (from/to file).
* Saving with EW when a Q-Reg is edited has been fixed (was broken earlier)
* SciTECO save point files are now named .teco-X-BASENAME
When using IOView for Q-Regs, there will be no way to sensible count
the save points. Each write of a Q-Reg may be to another file.
Therefore, we number save-points globally.
If the sequence of writes has to be reconstructed manually,
one can still look at the save point files' modification dates
* give more informative error messages when saving a file fails
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