Bugfix/bitwise ops sometimes return negatives#49

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quetzalcoatl:bugfix/bitwise-ops-sometimes-return-negatives

Commits on Oct 24, 2018

added bunch of tests that show that and64/or64/shift64 are unsafe for large numbers that may be treated as signed
quetzalcoatl
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forced and64/or64 result to be unsigned
quetzalcoatl
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corrected and simplified both shift64, added truncation to shiftleft64 to ensure it returns integer not longer than 64bit
quetzalcoatl
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refactor/cleanup: no need to recalculate true constants
quetzalcoatl
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refactor/cleanup: added 'var' to limit scope of some variables, just in case
quetzalcoatl
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improved sqrt's sanity check, our approx algo is NOT safe for negatives
quetzalcoatl
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added note how to run these tests
quetzalcoatl
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