Revert "Convert functionality to pysol-cards mod."

This reverts commit 74441a1746 which
appears to have caused a tests slowdown:

https://github.com/shlomif/PySolFC/issues/119 .

.appveyor.yml

@@ -14,7 +14,6 @@ install:
     - python3 -mpip install py2exe
     - python3 -mpip install pycotap
     - python3 -mpip install pygame
-    - python3 -mpip install pysol-cards
     - python3 -mpip install random2
     - python3 -mpip install six
     - perl -v

.travis.yml

@@ -39,7 +39,7 @@ before_install:
 install:
     - sudo cpanm --notest Capture::Tiny
     - sudo cpanm Code::TidyAll::Plugin::Flake8 Perl::Tidy Test::Code::TidyAll Test::Differences Test::TrailingSpace
-    - export PY_MODS='pycotap pysol-cards random2 six'
+    - export PY_MODS='pycotap random2 six'
     - "`which python3` -m pip install --upgrade flake8 flake8-import-order $PY_MODS"
     - "sudo /usr/bin/python3 -m pip install --upgrade $PY_MODS || true"
     - "sudo `which python2` -m pip install --upgrade $PY_MODS"

pysollib/pysolrandom.py

@@ -34,8 +34,6 @@ except ImportError:
         "You need to install " +
         "https://pypi.python.org/pypi/random2 using pip or similar.")
 
-from pysol_cards.random import RandomBase  # noqa: I100
-
 
 # ************************************************************************
 # * Abstract class for PySol Random number generator.
@@ -44,7 +42,7 @@ from pysol_cards.random import RandomBase  # noqa: I100
 # ************************************************************************
 
 
-class BasicRandom(RandomBase):
+class BasicRandom:
     # MAX_SEED = 0L
     # MAX_SEED = 0xffffffffffffffffL  # 64 bits
     MAX_SEED = int('100000000000000000000')  # 20 digits
@@ -174,9 +172,20 @@ class MFXRandom(BasicRandom):
     def choice(self, seq):
         return seq[int(self.random() * len(seq))]
 
+    # Get a random integer in the range [a, b] including both end points.
+    def randint(self, a, b):
+        return a + int(self.random() * (b+1-a))
+
     def randrange(self, a, b):
         return self.randint(a, b-1)
 
+    def shuffle(self, seq):
+        n = len(seq) - 1
+        while n > 0:
+            j = self.randint(0, n)
+            seq[n], seq[j] = seq[j], seq[n]
+            n -= 1
+
 
 # ************************************************************************
 # * Linear Congruential random generator
@@ -261,6 +270,13 @@ class LCRandom31(MFXRandom):
 
         return a + (ret % (b+1-a))
 
+    def shuffle(self, seq):
+        n = len(seq) - 1
+        while n > 0:
+            j = self.randint(0, n)
+            seq[n], seq[j] = seq[j], seq[n]
+            n -= 1
+
     def reset(self):
         self.setSeed(self.seed)