add  是否是学科负责人和是否是课程负责人到类JS_Tea
modify nj and nj_dal
add some dal
finish all entities.
add view's dal.but write nothing.

almost done.
modify viewDAL
modify some pros
modify dbcon.cs
add some DAL classes and modify part of entity classes
db recorrection
Merge github.com:JessenPan/ZYNLPJXT

Conflicts:
	Utility/DbConnection.cs
	ZYNLPJXT.csproj
an update