4.3
2014-4-15 save all value in char* type
2014-4-18 add insert
2014-4-19 insert completed and tested
add getNumberOfAttribute in table.h,which is used in insert stmt
2014-4-23 insert completed
2014-5-1 new insert, add type checking, support disorder insert
2014-5-4---support "show tables"
The memory leak in join is not fixed. The lock array in hash table may
be the underlying reason for memory leak. This commit is submitted
before I try to fix the problem of lock array in hashtable.
Before seeking help from scdong
备份
0515fzh
0516merge with yk
Merge remote-tracking branch 'origin0516/master'

Conflicts:
	Parsetree/ semantic_analysis.cpp
	Parsetree/ExecuteLogicalQueryPlan.cpp
	Parsetree/function.cpp
	Parsetree/lex.yy.c
	Parsetree/parsetree2logicalplan.cpp
	Parsetree/sql.l
	Parsetree/sql.tab.cpp
	Parsetree/sql.ypp
	Parsetree/wc2tb.cpp
	Scheduler/Dataflow.cpp
	Scheduler/Dataflow.h
merge with casa
Merge remote-tracking branch 'casa0516/master'
All the unnecessary source files are removed.
Fixed memory leak caused by too frequently memory allocaton and free of
small size.
Remove unnecessary files and add gtest
Last commit is not complete.