remove uneeded seeding of random generator

alib2algo/src/regexp/generate/RandomRegExpFactory.cpp

@@ -16,8 +16,6 @@ namespace regexp {
 namespace generate {
 regexp::UnboundedRegExp RandomRegExpFactory::generateUnboundedRegExp( size_t leafNodes, size_t height, size_t alphabetSize, bool randomizedAlphabet ) {
-	srand( time( NULL ) );
-
 	if(alphabetSize > 26)
 		throw exception::AlibException("Too big alphabet.");

alib2algo/src/string/generate/RandomStringFactory.cpp

@@ -18,8 +18,6 @@ namespace string {
 namespace generate {
 string::LinearString RandomStringFactory::generateLinearString ( size_t size, size_t alphabetSize, bool randomizedAlphabet ) {
-	srand ( time ( NULL ) );
-
 	if ( alphabetSize > 26 )
 		throw exception::AlibException ( "Too big alphabet." );

alib2algo/src/string/generate/RandomSubstringFactory.cpp

@@ -25,8 +25,6 @@ string::LinearString RandomSubstringFactory::generateSubstring ( size_t size, co
 	if ( size > string.getContent ( ).size ( ) )
 		throw exception::AlibException ( "String not long enough" );
-	srand ( time ( NULL ) );
-
 	size_t begin = std::random_devices::semirandom ( ) % ( string.getContent ( ).size ( ) - size + 1 );
 	std::vector < alphabet::Symbol > data ( string.getContent ( ).begin ( ) + begin, string.getContent ( ).begin ( ) + begin + size );