reverse cast direction tree -> string

alib2data/src/string/LinearString.cpp

alib2data/src/string/LinearString.h

alib2data/src/tree/ranked/PostfixRankedTree.cpp

alib2data/src/tree/ranked/PostfixRankedTree.h

...2data/src/tree/ranked/PrefixRankedBarNonlinearPattern.cpp

alib2data/src/tree/ranked/PrefixRankedBarNonlinearPattern.h

alib2data/src/tree/ranked/PrefixRankedBarPattern.cpp

alib2data/src/tree/ranked/PrefixRankedBarPattern.h

alib2data/src/tree/ranked/PrefixRankedBarTree.cpp

alib2data/src/tree/ranked/PrefixRankedBarTree.h

alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.cpp

alib2data/src/tree/ranked/PrefixRankedNonlinearPattern.h

alib2data/src/tree/ranked/PrefixRankedPattern.cpp

alib2data/src/tree/ranked/PrefixRankedPattern.h

alib2data/src/tree/ranked/PrefixRankedTree.cpp

alib2data/src/tree/ranked/PrefixRankedTree.h

alib2data/src/tree/unranked/PrefixBarTree.cpp

alib2data/src/tree/unranked/PrefixBarTree.h

alib2raw/src/string/raw/LinearString.h