[issue1881] increase parser stack limit

[Christian Heimes]

Christian Heimes added the comment:

10-fold is very progressive. Let's be a bit more conservative for
platforms with a small stack size (e.g. *BSD and mobile phones). A
parser stack limit of about 1500 would still allow roughly 100 deeply
nested lists.

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nosy: +tiran
priority:  -> normal

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<http://bugs.python.org/issue1881>
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