Added stretching energy plugin

Samo Penic

2019-03-09 4df6ed05246cf8bc9fe0cb0c8766ebc368d2f512

 src/shcomplex.c

@@ -69,7 +69,7 @@
    if(sph->co != NULL) free(sph->co);
    if(sph->ulm !=NULL) free(sph->ulm);
    if(sph->ulmComplex !=NULL) free(sph->ulmComplex);

    if(sph->sumUlm2 !=NULL) free(sph->sumUlm2);
        if(sph->Ylmi!=NULL) {
            for(i=0;i<sph->l;i++){
                if(sph->Ylmi[i]!=NULL){