a bug in sort found, support table name and attr name.
sort bug...
support multi attributes sort.
project system function.
cast, upper, substr and trim supported.
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"
Merge remote branch '20140507/master'
备份
修改了project为多线程。
由输入的参数得到输出结果的时候需要得到类型和长度信息。
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