Performance/Relevancy testing module and optimization of DFR

Name	Aarsh Shah
IRC nick	aarshkshah1992
Timezone	UTC +5:30
Work hours	WORK HOURS
Official mentor	Sehaj Singh Kalra
Code repository	​https://github.com/aarshkshah1992/xapian
Melange	​http://www.google-melange.com/gsoc/project/details/google/gsoc2014/aarshkshah1992/5825904093691904

Implement a performance test module in Xapian which times the execution of operations crucial to Xapian and then uses a graphing script to create attractive graphs from the perf test output.Along with that, DFR weighting and query expansion schemes will be profiled and optimized. Also, the relevance of the weighting schemes will be tested using the evaluation module along with comparing the performance of the various weighting schemes to decide on a default weighting scheme for Xapian.

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