moved files out of subdirectories, added required documentation

src/berzerk_brew.cc

@@ -0,0 +1,24 @@
+#include "berzerk_brew.h"
+
+#include <algorithm>
+#include "constants.h"
+
+berzerk_brew::berzerk_brew(const position &pos):
+        potion{potion_type::BERZERK_BREW, DURATION, pos} {}
+
+void berzerk_brew::apply(const enum race &race, int &HP, int &ATK,
+                         int &DEF, fraction &base_hit_rate) {
+        if (remaining_duration != 0) {
+                ATK *= ATK_MUL * (race == DROW ? DROW_POTION_MUL : 1);
+                DEF *= DEF_MUL * (race == DROW ? DROW_POTION_MUL : 1);
+                --remaining_duration;
+        }
+}
+
+int berzerk_brew::get_priority() const {
+        return CALC_MID;
+}
+
+const char *berzerk_brew::get_name() const {
+        return "BB";
+}