Continue long statements over multiple lines

[devenbansod]

Some of the statements like https://github.com/SSMS-Pilani/Mess-Management-System/blob/master/Mess%20Management%20System/formAddSupplier.vb#L98
and especially where the query string has been defined, are very long indeed and it becomes very difficult to read and edit them.

We should start using the continuation character _ to split such long statements onto 2 or more lines.
Example of such change is here :

Mess-Management-System/Mess Management System/formRebate.vb

Line 25 in b669f4d

Dim query As String = "SELECT monthly_details.S_ID, student.NAME ,monthly_details.MEALS_NOT_TAKEN, " _