Remove some Dhb and replace them with PM prefix

Author: SergeStinckwich

src/Math-Matrix/PMSymmetricMatrix.class.st

@@ -1,5 +1,5 @@
 "
-This class can be instantiated like DhbMatrix via #rows:, but the user has to make sure that this matrix is indeed symmetric as this is not internally checked for speed reasons.
+This class can be instantiated like PMMatrix via #rows:, but the user has to make sure that this matrix is indeed symmetric as this is not internally checked for speed reasons.
 "
 Class {
 	#name : #PMSymmetricMatrix,

src/Math-Numerical/PMLagrangeInterpolator.class.st

@@ -4,8 +4,6 @@ A PMLagrangeInterpolator takes a set of points (include each with #add:) and int
 This is appropriate for interpolation only (interior to the region of the set of values), and sensitive to several conditions.
 
 The method value: yields an approximation at a given value of the independent variable. Calculation is deferred until value is sent. If the set of points is fixed, NewtonInterpolator precomputes the value function. If the set of points is likely to change more often than interpolated values are needed, this is a fair choice.
-
-(c) Copyrights Didier BESSET, 2000
 "
 Class {
 	#name : #PMLagrangeInterpolator,

src/Math-Numerical/PMLanczosFormula.class.st

@@ -1,5 +1,5 @@
 "
-A DhbLanczosFormula is a singleton class which calculates an approximation to Gamma(x). 
+A PMLanczosFormula is a singleton class which calculates an approximation to Gamma(x). 
 Gamma function is a continuous extension to Factorial. Gamma(x + 1) = x * Gamma(x). For integers Gamma(n) = (n-1) factorial. 
 
 This is called from Number>>gamma, and Number>>logGamma.

src/Math-Numerical/PMRombergIntegrator.class.st

@@ -1,5 +1,5 @@
 "
-A DhbRombergIntegrator implements the Romberg Method. This uses Richardson extrapolation on the Trapezoid method to generate a higher order estimate.
+A PMRombergIntegrator implements the Romberg Method. This uses Richardson extrapolation on the Trapezoid method to generate a higher order estimate.
 
 Evenly spaced samples are used.