Minor changes:

1.  Added enhancements and improved the methods of solving exact 
differential equation (#1955) and (#1823)
2. Support for differential equations with linear coefficients and those 
that can be reduced to separable and linear form (#1940, #1864,  #1883)
3. Support for first order linear general PDE's with constant coefficients 
(#2109)
4. Added is_algebraic_expr() method (#2176)

Major changes:
Built basic infrastructure of the PDE module (#1970) 

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