Added MADMMplasso.h (#17)

Because `admm_MADMMplasso_cpp()` is a subfunction of `hh_nlambda_loop_cpp()`.

src/MADMMplasso.h

@@ -0,0 +1,30 @@
+#ifndef MISC_H
+#define MISC_H
+
+#include <RcppArmadillo.h>
+Rcpp::List admm_MADMMplasso_cpp(
+  const arma::vec beta0,
+  const arma::mat theta0,
+  arma::mat beta,
+  arma::mat beta_hat,
+  arma::cube theta,
+  const double rho1,
+  const arma::mat X,
+  const arma::mat Z,
+  const int max_it,
+  const arma::mat W_hat,
+  const arma::mat XtY,
+  const arma::mat y,
+  const int N,
+  const double e_abs,
+  const double e_rel,
+  const double alpha,
+  const arma::vec lambda,
+  const double alph,
+  const Rcpp::List svd_w,
+  const Rcpp::List tree,
+  const Rcpp::List invmat,
+  const arma::vec gg,
+  const bool my_print = true
+);
+#endif

src/hh_nlambda_loop_cpp.cpp

@@ -1,4 +1,5 @@
-#include <RcppArmadillo.h>
+#include "MADMMplasso.h"
+
 // [[Rcpp::depends(RcppArmadillo)]]
 Rcpp::List hh_nlambda_loop_cpp(
   arma::mat lam,